JPS6055891B2 - magnetic playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic playback device that can adjust playback time without damaging recorded content.

Conventionally, when stenography or typing is performed while listening to the contents recorded on a magnetic tape with a transcriber, the speed of tape feeding is so fast that the stenography or typing may not be able to keep up.

In such cases, the tape is stopped by operating the hood switch, the shorthand or typing is completed, and the tape is restarted. In this way, if you stop in the middle of a syllable, the syllable will be meaningless even if you restart it, so we added a so-called backspace pedal to return the tape by operating the hood switch. A transcribing machine has been developed.

However, this machine has added foot operation, and
This requires skill because it requires extra backspace and time is lost.

In addition, variable speech control devices have recently been developed in which the frequency characteristics do not change even when the speed is changed, but the circuitry is complex and expensive, and when actually used, it does not extend the time axis. It has disadvantages such as excessive shorthand and inefficient shorthand and typing.

This invention eliminates the above-mentioned drawbacks, and has a structure in which the tape is stopped or reversed at a very low speed at a syllable break, and if necessary, the tape is reversed again at a constant speed in response to the voice of the stenographer or typist. Another object of the present invention is to provide a simple magnetic reproducing device.

An embodiment of the present invention will be described below with reference to the drawings.

The recorded magnetic tape 1 is connected to a playback head 2 through a first-stage amplification circuit 3, a volume 4, and an output amplification circuit 5 so that its playback output is output from a speaker 6. The motor 7 for driving the magnetic tape 1 is connected to the tape recorder power supply Vcc so as to be controlled by a switching transistor 9 connected in series via a main switch 8.

The transistor 9 is connected to its base so as to receive a restart signal from the microphone 10. That is, the restart microphone 10 is connected to a comparator 13 via an amplification circuit 11 and a rectification circuit 12. The comparator 13 is connected via an AND circuit 14 and an OR circuit 15 to the set side S of a reset/set flip-flop circuit (hereinafter referred to as RS-FF) 16. The output from the head 2 is connected to the AND circuit 14 so as to be inverted by an inverter 19 via a rectifier circuit 17 and a comparator 18 and then applied to a reproduced signal.

The OR circuit 15 is also connected so that a signal from a first pulse generating circuit 20 connected to the tape recorder's power supply CC through the main switch 8 is applied thereto.
On the other hand, the head 2 is on the reset side R of the RS-FFl6.
, the amplification circuit 3, the rectifier circuit 17, and the comparator 18 so that the output signal of the second pulse generation circuit 21 to which the reproduced output is applied is applied, and this RS-
The output signal of FFl6 is transmitted to the switching transistor 9.
is connected so that it is applied to the base of.

The operation of the magnetic reproducing apparatus constructed in this way will be explained with reference to FIG.

First, the main sweets. When circuit 8 is turned on, power is applied to the tape recorder as shown in A, the output of the first pulse generating circuit 20 becomes H as shown in B, and is applied to the OR circuit 15, and the output becomes H as shown in C. Yes, RS1FF16
is set state. Therefore, the output of the S-FF16 is applied to the base of the switching transistor 9 as shown in D, turning on the transistor 9 and applying the power E to drive the motor 7.

The tape 1 is fed by the drive of the motor 7, and when it reaches the -audio section, the reproduction output is output from the head 2 via the speaker 6.

As shown in FIG. 2F, the reproduction output taken out through the first stage amplifier circuit 3 is applied to the second pulse oscillation circuit 21 as an output signal shown in G via the rectifier circuit 17 and the comparator 18. be done.

However, when the playback output disappears due to syllables, etc.,
A pulse signal as shown in is generated by the second pulse signal generation circuit 2.
1 to the reset side R of RS-FF16, a reset signal is applied to the transistor 9, the transistor 9 is turned off, and the power supply to the motor 1 is stopped. In this way, Tape 1 automatically stops when it comes to a syllable, a part where there is no sound, such as when someone is taking a deep breath. I end up typing the place completely.

Then, when you are ready to type the next type, when you say ``Hello,'' the sound is transmitted from microphone 10 to amplification circuit 1.
1 and becomes the audio signal 1.

When the audio signal 1 is rectified and the signal J obtained through the comparator 13 is applied to the AND circuit 14, the AND circuit 14 becomes H and a signal as shown by K is applied to the OR circuit 15. Therefore, the output voltage of the OR circuit 15 becomes "H",
The signal C is applied to the set side S of RS-FFl6 and R
Set S-FFl6.

When RS-FF16 is set, its output becomes L as shown in FIG. 2D, turning on switching transistor 9 and driving motor 7.

After repeating this process, the stopped state of the tape can be extended according to the convenience of the stenographer or typist, and if necessary, the tape can be stopped by emitting a voice for restarting through the restarting microphone. can begin sending immediately.

Note that when the tape contains audio, the output of the inverter 19 becomes L and is added to the AND circuit 14, so
For example, even if the audio from the speaker 6 is input through the restart microphone 10, the output of the AND circuit 14 is L,
There is no risk of malfunction.

The present invention is not limited to the above-mentioned embodiment, but the tape may be transported at an extremely slow speed by rotating the motor at a low speed without stopping it using a combination of a switching transistor and a motor.

Also, the circuit configuration and parts used are not limited to the examples. Various modifications may be made without changing the purpose.

As detailed above, according to this invention, the tape always stops or slows down at the syllable break, so shorthand or typing can be completed during that time, and once the shorthand or typing is completed, the tape is sent again. Therefore, it is possible to provide a magnetic reproducing device with a simple configuration that allows a stenographer or typist to freely control the tape feeding state.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the same example. 1...Magnetic tape, 2...Magnetic head, 3, 5, 1
1... Amplifier, 4... Volume, 6... Speaker, 7... Motor, 8... Power switch, 9...
Switching transistor, 10... Restart microphone, 12, 17... Rectifier circuit, 13, 18... Comparator, 14... AND circuit, 15... OR circuit,
16...Reset ●Set flip-flop circuit, 1
9... Inverter, 20, 21... Pulse generation circuit.

Claims (1)

[Claims] 1. In a magnetic playback device that drives a recorded magnetic tape and plays it back using a head, there is an unrecorded part detection unit that detects unrecorded parts of the magnetic tape, a restart microphone, and a voice input to this microphone. The drive of the magnetic tape is stopped or the magnetic tape is caused to run at a low speed based on the output signals from the audio signal detection unit that detects the signal and the unrelated sound part detection unit, and the running of the magnetic tape is determined again based on the output signal from the audio signal detection unit. What is claimed is: 1. A magnetic reproducing device characterized by comprising a control section for fast driving.